Kolon Kanseri
Özet
Kolorektal kanser (KRK), gastrointestinal sistemin en sık görülen ve dünya genelinde ölüm oranı yüksek malignitelerinden biridir. KRK gelişimi %60 sporadik, %30 ailesel ve %10 kalıtsal faktörlere dayanmakta olup; genetik mutasyonlar, yaş, obezite ve sigara kullanımı önemli risk faktörleri arasındadır. Teşhis sürecinde kolonoskopi altın standart kabul edilirken, evreleme Amerikan Kanser Komitesi'nin TNM sistemiyle yapılmaktadır. Erken evrelerde semptomlar genellikle belirsizdir, ancak hastalık ilerledikçe hematokezya, karın ağrısı ve bağırsak alışkanlıklarında değişiklikler gözlenir. Lokalize kolon kanserinde temel tedavi yöntemi, total mezokolik eksizyon prensibiyle gerçekleştirilen radikal cerrahidir. Evre 1 ve 2'de cerrahi yeterli olabilirken, lenf nodu tutulumu olan Evre 3 vakalarında cerrahi sonrası standart FOLFOX kemoterapisi uygulanır; metastatik Evre 4 vakalarında ise tedavi palyatif odaklıdır. Prognoz, tümörün evresi ve yerleşimine bağlı olarak değişmekte, sol kolon yerleşimli tümörler genellikle daha iyi seyir göstermektedir.
Colorectal cancer (CRC) is one of the most common gastrointestinal malignancies worldwide with high mortality rates, originating 60% sporadically, 30% familially, and 10% hereditarily. Key risk factors include genetic mutations, advanced age, obesity, and smoking, while colonoscopy remains the gold standard for diagnosis and the TNM system is utilized for staging. Although early-stage patients are often asymptomatic, advanced cases present with hematochezia, abdominal pain, and changes in bowel habits. Radical surgery based on the principle of total mesocolic excision is the primary treatment for localized cancer. While surgery may suffice for Stages 1 and 2, Stage 3 cases involving lymph nodes require postoperative FOLFOX chemotherapy, and Stage 4 metastatic cases focus on palliative care. Prognosis varies by stage and location, with left-sided tumors generally offering a better outlook.
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